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procedure WB_Set3DBorderStyle(Sender: TObject; bValue: Boolean);
var
  Document : IHTMLDocument2;
  Element : IHTMLElement;
  StrBorderStyle: string;
begin
//去掉邊框
  try
    Document := TWebBrowser(Sender).Document as IHTMLDocument2;
    if Assigned(Document) then
    begin
      Element := Document.Body;
      if Element <> nil then
      begin
        case BValue of
          False: StrBorderStyle := 'none';
          True: StrBorderStyle := '';
        end;
        Element.Style.BorderStyle := StrBorderStyle;
      end;
    end;
  except
  end;
end;

在對應的WebBrowser 事件中加入即可

procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
  const pDisp: IDispatch; var URL: OleVariant);
begin
  W_Set3DBorderStyle(sender,false);
end;